Adhesive applying means for containerforming machine



May 8, 1956 J. G. VERGOBBI ADHESIVE APPLYING MEANS FOR CONTAINER-FORMINGMACHINE Filed Sept. 25, 1952 5 Sheets-Sheet 1 INVENTOR. end/eggo/ BYArray/Y6) May 8, 1956 J. G. VERGOBBI 2,744,491

ADHESIVE APPLYING MEANS FOR CONTAINER-FORMING MACHINE Filed Sept. 25,1952 3 Sheets-Sheet 2 INVENTOR.

@iwunlu li HTT'OIYNE'Y y 8, 1956 J. G. VERGOBBI 2,744,491

ADHESIVE APPLYING MEANS FOR CONTAINER-FORMING MACHINE Filed Sept. 25,1952 3 Sheets-Sheet 3 IN V EN TOR.

Q/on BY QMQA W.

United States Patent ADHESIVE APPLYING lViEANS FOR CONTAINER- FGRMINGMACHINE John G. Vergohbi, Quincy, Mass., assignor to Pneumatic ScaleCorporation, Limited, Quincy, Mass, a corporation of MassachusettsApplication September 25, 1952, Serial No. 311,370

Claims. (Cl. 118-5) This invention relates to a container-formingmachine and particularly to web-feeding and registering mechanism for acontainer-forming machine.

The invention has for an object to provide a novel and improvedcontainer-forming machine wherein a printed web of flexible sheetmaterial is utilized to produce successive container-forming sectionsand wherein novel provision is made for controlling the feeding of theweb to effect registration of successive printed sections with relationto adhesive-applying mechanism and to websevering means.

With this general object in view and such others as may hereinafterappear, the invention consists in the containerforming machine and thevarious structures, arrangements and combinations of parts hereinafterdescribed and particularly defined in the claims at the end of thisspecification.

In the drawings illustrating the preferred embodiment of the presentinvention:

Fig. l is a side elevation of a container-forming machine embodying thepresent Web-feeding, adhesive-applying and registering mechanisms; 1

Fig. 2 is a plan View of a portion of the Web of con tamer-formingmaterial illustrating the adhesive stripsand registration marks; g y 3Fig. 3 is a front elevation of the mechanism; from the line 3-3 ofFig.1; V V Y Fig. 4 is across section of differential driving mecha nismtaken on, line, 4-4- of Fig. 3;

Fig. 5 is a cross section taken on line 55 of Fig.4;

Fig.6 is aplan view of the web-feeding and adhesive: applying rolls andgearing mechanisms; v

Fig. 7 is a side elevation of thelatchpcam lever. and cams of theregistration mechanism; 1

Fig. 8 is a detailview in side elevation of the pawl and ratchetmechanisms; v

Fig. 9 is an electrical wiring diagram for the control mechanism; and aFig. 10 is a side elevation of the control mechanism timing device. p I

In general, the present invention contemplates novel Web-feedingand-registering mechanism for a containerforming machine forcontinuously advancing a; printed web .of container-forming materialinto operative rela: tion to adhesive-applying mechanism adapted toapply strips of adhesive in a predetermined pattern to succes-. siveprinted sections of the web, and to a cutterfor sever,- ing successiveprinted, sections of the web advanced. into operative relation to thecontainer-forming mechanism. The container-forming machine maycornprisea machine as viewed of the type known in the trade as a double-packagemaker having a plurality of horizontally extended and intermittentlyoperated container-forming blocksabout which an inner lining section andan outer carton are successively;

wrapped to form a lined container. I v I In practice, it has been foundthat when acontinuous printedweb of container-forming material is fed toa container-forming machine to form a plurality of sucgu tar PatentedMay 8, 1 956 cessive containers, the printed web sections may vary froma predetermined length due to changes in atmospheric conditions withinthe web itself and the stresses caused by the web-feeding mechanisms.This factor creates a serious problem when each container orpackage-forming section of the web contains printed matter, such asbrand names and the like. In order that commercially acceptable printedpackages may be formed by the packaging machine, each printedpackage-forming section of the web must be substantially in registerwith the adhesiveapplying and web-severing mechanisms withinpredetermined tolerances. It has been found that if one of thepackage-forming sections is not in proper register the amount ofdeviation increases in successive web-feeding cycles. The novel andimproved web-feeding adhesiveapplying and registering mechanism of thepresent invention substantially eliminates this problem and enables thecontainer-forming machine to successfully form successive printedpackages which will be commercially acceptable from the continuouslymoving web of containerforming material.

In accordance with the present invention, provision is made fordetecting a variation of the continuously advanced web from apredetermined position relative to printed indicia, such as registrationmarks on successive sections at a predetermined time in the continuousadvance thereof and for effecting a corrective feeding of the web duringsuch advance to eifect registration of successive printed sections withthe adhesive-applying mechanism and with the cutter for severingsuccessive sections whereby the variations in length of successiveprinted sections are within predetermined tolerances of thepredetermined normal length.

In the preferred embodiment of the invention, the adhesive-applyingmechanism and the web-severing means are operated in timed relation tothe container-forming machine and the web is preferably fed at acontinuous rate such as to advance a length slightly less than thepredetermined. normal length each cycle of operation; Cumulative laggingof successive printed sections will be detectedby the control means toeifect acorrective'feeding stroke which is preferably arranged toadvance the web an additional incrementsuch that .the total advanceduring a corrective feeding cycle is slightly more than thepredetermined normal length. Thus, in practice, a

', web having a normal predetermined length between registration-markswill require a corrective. advancing stroke periodically as, thecumulative effect of the shortened feeding rate is detected and anyvariation in the spacing of the registration markson the web due toatmospheric 1 or other causes will also effect a corrective advancingferent lengths ofprintedsections in a novel and simple Referringnow tothe drawings, in the illustrated bodiment of the invention provision is.made for con:

tinuously, advancing a printed .web Ofcontainer-forming. material It)through a distance substantially equal to.

and preferably slightly less than the normal predeter. ined'length ofeach successive individual printed sctionof the web during each'cycle ofoperation of the. v packaging machine, and for concurrently applyingspaced strips of adhesive in a predetermined pattern tosuecessiveprinted sections of the web. Theweb is provid'ed with spacedregistration marks ll, and provision, is made for detecting anyvariation from a pre,det e1-y mined position of successive registrationmarks at-a. predetermined time in each cycle and for" advancing the aweb an additional increment when such variation is detected. Thepackaging machine embodying the present invention may comprise any usualor preferred form now upon the market, such for example as the machineillustrated in United States Patent to Hesser. No. 1,020,821, issuedMarch19, 1912. Reference may be had to said patent for a description ofthe packaging machine, and only such portion thereof as will enable thepresent invention to be understood has been illustrated.

As best shown in Fig. l, a printed web of containerforming material iswithdrawn from supply roll 18 by driven feed rolls 40, 42. The web isfirst arranged to pass from the supply roll 18 between cooperatingscoring rolls 22, 24 adapted to remove any curl in the web 10, andthereafter passes around feed roll 40 and between feed rolls 40, 42.Adhesive pattern-applying roll 46 is positioned adjacent feed roll 42 inpressed relation thereto, and the web 10 passes between said rolls 42,46, at which time the predetermined adhesive pattern illustratedin Fig.2 is applied to the successive lining sections of the web 10. Inpractice, the adhesive strips are preferably applied in a predeterminedposition oneach web section to form the side seam and a bottom seal forthe package produced on the packageforming machine. The web 10thereafter moves past a photo-sensitive detector. unit indicatedgenerally at 58, between idler rolls 53, 55, through a paper breaksafety. device 50 including take-up roller 52; and thence to theintermittently operated feeding rolls 54, 56 and cutting mechanism 57forming a part of the containerforming machine.

As herein shown, the feed rolls 54, 56 are arranged to be intermittentlyoperated through a rack and pinion drive 47 actuated by a cam 49 fast onthemain cam shaft 68 of the container-forming machine. It will beobserved that the length of material advanced by the continuouslyoperated feed rolls 40, 42 during the idle period of the intermittentlyoperated feed rolls 54, 56 will be taken up by the weighted andpivotally mounted roller 52. The intermittently operated rolls arearranged to be rotated in a manner such that the entire slack portion ofthe continuously fed web is taken up and advanced by the feed rolls 54,56 each intermittent feeding cycle so that the web is taut between thefeed roll 42 and the feed roll 56. The upper roller 54 of theintermittent drive comprises an idler so that when the web is fullyadvanced. to a taut condition, the rolls 54, 56 may slip on the web.Thus in operation, the web is intermittently advanced in variablelengths a distance corresponding to the rate of continuous advance andthe corrective feeding movements effected by the feed rolls 40, 42 eachcycle of operation whereby successive container-forming sectionsadvanced will be in substantial registration with the severing means 57within predetermined tolerances. It will also be observed that in theevent'of a break in the web 10, the weighted roller 52 will be rockeddownwardly to open switch contacts of the'safety device 50 anddiscontinue operation of the machine.

In the operation of the present web-feeding device during each cycle ofoperation of the package-forming machine, the continuously moving web 10is normally advanced a distance approximately A less than thepredetermined normal length of one of the web package sections, and isadditionally advanced an increment slightly less than the remaining ,6the total normal advance thus far being slightly less than thepredetermined normal length of a package section. The control mechanism48, responsive to the detector unit 58, is arranged to advance the web10 a further increment whenever improper registration is detected by thephotosensitive detector unit 58, the total advance during a correctingcycle being slightly more than the predetermined normal length.

In general, the control mechanism 48 includes: a photo-sensitivedetector, indicated generally at 58, arranged to cooperate with thespaced registration marks 12, positioned one on each package section ofthe web 10, during each cycle of operation; a timing mechanism 60 isarranged to render the detector unit 58 operative for a predeterminedlength of time during each cycle of operation; and a solenoid 59arranged to actuate latch mechainsm 62 to render the corrective feedingmeans operative when a deviation from proper registration is detected bythe detector unit 58 in order that the web be advanced a furtherincrement into proper package-forming registration.

The detector unit 58 herein illustrated is arranged to be excited toactuate the web-advancing mechanism only when the light beam isintercepted by a mark during the scanning period, that is, when thecircuit is closed by the timing switch, and only when the light beam iscut off by the leading edge of a rapidly passing mark. If'the mark doesnot appear during the scanning period, no correction is made, and if thebeam falls directly on the mark and then falls on the lighter portion ofthe passing web during the scanning period, no further correctingadvance of the web is made.

Referring now particularly to Figs. 1 and 6 for a more detaileddescription of the web-advancing, adhesiveapplying and registeringmechanisms, as therein shown, driven feed rolls 40, 42 are arranged onesubstantially above the other to be rotated in opposite directions onefrom the other to thereby withdraw the printed web of container-formingmaterial 10 from the supply roll 18 which is rotatably positioned onstud 20. The withdrawn web 10 is unwound from the supply roll 18 andpassed between scoring rolls 22, 24, each rotatably positioned on studs26, 28, and thereafter passes between feed rolls 40, 42 arranged tocooperate in pressed relation with each other to advance the web 10continuously in the timed relation to the operation of thecontainer-forming machine.

The driven feed rolls 40, 42, rotatable within bearings set in themachine frame are driven from and arranged to be rotated by the maindrive shaft 68 of the packaging machine by connections including spurgear 70'fast on sleeve 188 arranged to cooperate with spur gear 74 faston shaft 76, bevel gears 80, 82, inclined shaft 84, bevel gears 86, 88,shaft 90, bevel gears 92, 94, shaft 96 and bevel gears 100, 102, thelatter being fast on the main drive shaft 68 of the packaging ma chine.Feed roll 42 is connected in driving relation to feed roll 40 by meansof spur gears 104, 106 fast on roller shafts 76, 110 respectively, saidrolls being driven continuously in timed relation to the operation ofthe container-forming machine during the normal cycle of web feeding.

As best illustrated in Fig. 6, the adhesive pattern applying roll 46fast on shaft 72 rotatably set in bearings in the machine frame isprovided with spur gear 112 arranged to cooperate with spur gears 114,116 fast on roll shafts 118, 120 respectively to rotatably drive theadhesive-transfer rolls 124, 126. Adhesive-transfer rolls 124, 126 arearranged to cooperate with the adhesiveapplying roll 46 and are adaptedto receive a supply of liquid adhesive from adhesive supply pipe 130 andto transfer the liquid adhesive from its source of supply in a smooth,even manner to the adhesive-applying roll 46, which in turn applies thesame to the moving web in a predetermined pattern. The surplus adhesivefalls into a pan 230 and is guided into a conduit 232 back to a supplytank to be recirculated. The adhesive-applying roller 46 may be of acircumference slightly less than the predetermined normal length of acontainer-forming section.

In practice, during one cycle of operation of the container-formingmachine, the web is advanced through rotation of driven feed rolls 40,42 such that the web is advanced a distance equal to substantially $6less than the predetermined normal length of an individualpackage-forming section of the web 10. The web 10 is then advanced anadditional small increment so that at the end of the second increment ofadvance the total advance is lightly less than the predetermined normallength of an individual package-forming section. In other words, thelength of web advanced each cycle during the continuous feed of the webis primarily governed or controlled by providing feed rolls 40, 42 ofpredetermined diameter sizes such that during one revolution thereofthrough the drives heretofore described, the web 10 will only beadvanced a certain predetermined distance substantially less than thepredetermined normal length of each container-forming section, and anauxiliary webadvancing means is provided for advancing the web 10 anadditional small increment each cycle so that during each normal cycleof operation, the feed rolls eflfect advance of the web 10 a distanceslightly less than the predetermined normal length of said section.

In accordance with one feature of the present invention, such auxiliaryweb-advancing means is provided for the purpose of enabling the initialrate of advance of the web during each cycle to be adjusted toaccommodate variations in the predetermined normal length of thesections and to provide adjustment so as to assure a normal advance ofthe web a distance slightly less than such predetermined normal length.

Referring now more particularly to Figs. 3 and 9, the auxiliaryadvancing means includes a pawl and ratchet mechanism arranged to beactuated by a cam 128 fast on shaft 90 arranged to cooperate with camlever 130 pivotally mounted on stud 132 fast in the machine frame,said'cam lever 13!} having a cam roller 134 at one end thereof held incam-engaging position by spring 136 attached to lever 130 and themachine frame. The other end of the lever 130 is provided with a slot239 in which a connecting rod 14%) is 'adjustably securedL The otherendofrod 140 is adjustablyconnectedto a pawlcarrie'r l-38 pivotallymounted on a stud 148 and which carries a pawl l42 which is adapted tocooperate with ratchet 144 fast -onstud 143. A spur gear 150 also faston stud 148 is arranged to'mesh'with a gear 152 forming a' p art'of adifferential gear train 172 and which is rotatably mounted on shaft-'72.The gear 152 is held normally'in a stationary position by' suita'ble'braking means, indicated generally at 154,includin'g diskf1 56 fast onstud 148 and disk 158 carried' by bracket 160 mounted on the" machineframe. Disks 15 6, 1 58 "far arranged to be normally held infrictionalengagement with'each other by spring-pressed lever 164an'd' bolt-166 tomaintain gears 150, 152 inastationary position.

As illustrate'din Figs. '4'and 5, the differentialgear train; indicatedgenerally'at 172,*mounted on shaft '72 comprises a driving gear 1'74keyed fast onshaft 72' arranged to' revolve with said'shaft, and gears178, "180 arranged to each mesh with gear 174 are positionedon the.diameter line of gear 174 each on 'o'pp'osite'sides thereoful Saidgears'178, 180 :are mounted on studs -182,"134 fast inzgear 152 such thatthey'will remain stationary withrelation to .their.position on thediameter'line of driving'gear 174 and yet revolve on said .studswhen'd'riven by gear-174. .Gear 152, rotatably mounted on'shaft 72, isadapted to mesh'withlspur gear 150 and carry gears 178,180. on studs182, 184 fastened thereto, as heretofore described. A rotatable sleevemember'188- is mounted :loosely on'shaft 72 and is arranged toicarry.

keyed-thereto spurygear Wand internal-gear194 which isprovided withteeth'adapted to mesh with the teeth of gears 178,180. I

From the description thus far it Willbe seenthat the shaft-.72 is.drivenatIa constant rate offspeedin timed relationto thecontainer-forming machine'and that-the adhesive-applying roller 46 faston shaft 72 is'rotated ata constant speed.u"It will befurther observedthat the drive to the feed rolls 4t), 42 is effected through thedifferential gear train through gear 174 fast on shaft 72, gears 178,180, internal gear 194, and gears 70, 74 so that as long as the gear 152is held stationary, the feed rolls 140, 142 will be driven at a relatedconstant speed. Each cycle of operation, the pawl and ratchet mechanism142, 144 efIects a small increment of rotation of gear 152 therebyincreasing the rate of feed slightly, preferably so that the totaladvance per cycle is slightly less than the predetermined normal lengthof a Web section, since the present correcting mechanism is not designedto correct for overfeed of the web. As herein shown, such increment ofadvance may be varied by adjusting the length of stroke of the pawlcarrier 138 by adjusting the rod in the slot 239 or by connecting therod in a different one of a plurality of openings 237 formed in the pawlcarrier 138.

Thus, in operation, the initial length of web fed each cycle may beadjusted to conform substantially to or preferably slightly less thanthe predetermined normal length of each web section. It will be furtherobserved that since the adhesive pattern applying roller 46 is driven ata constant rate, and the rate of feed of the web may be variable, inpractice the web may slip relative to the adhesive-applying roller.However, since the difference in rate of travel is so slight suchslippage is negligible so that substantially correct application of thepredetermined adhesive pattern is effected each cycle of operation.

Referring now to Figs. 1, 7 and 8 in particular, similar cam-actuatedmeans are provided to advance the continuously moving web 11' a secondsmall increment in response to the detector mechanism 58 whenever saiddetector 58 is excited due to a deviation from a predetermined positionof advance of the package-forming sections. Said means includes a cam1259 fast on cam shaft 99 and a cam lever 137 provided with a raisedportion comprising a latch 62 and pivotally mounted on stud 132. Saidlever 137 is provided with cam roller 139 at one'end thereof and a pawland ratchet "mechanism 143,145' adjustably connectedjto its oppositeehdfl ay rod 141. Thepawl 143'is 'ca'rriedby an arm 238'loosely mountedon the stud" 148 Ratchet fast on stud 1481s arranged to rotate saidshaft when urged by;the' cam-actuated 'pawl"mechanism,"and in turn gear150 is rotated causing it to slip against brake means 154; Ashereinbefore' describe'djthe rotation of gear 156* is transmittedthroughthe diiferential gear train 172' to advance the" feed rolls 49,"42 an additional increment independently ofithe' adhesive rolls as,124,126 and thus to bring the successive package-forming sections intoproper registration with the :adhesive-applyin g mechanism and theweb-severingmeans. I During the normal jeeding operation, apivotally,mounted latch-engaging member 262 connected; to thearmature 263 ofsolenoid-;59i;engages' the latch 62*an'cl: holds ,thesame out ofcam-engaging position. -However,. when the detector unit '53 is'excited,indicating thatthe packagewforming section deviates, from apredetermined normal position with relation topackage-formingmech;

aidisms during predetermined scanning period, the; latch v62 is releasedby thel-operation of solenoid 59. Thus, the cam-operatedlpawl, andratchet .mechanism 143, 1455s renderedjoperative .to. advance the webugh the means hereinbefore described. As illustrated jg. 7, 'theweb-advance correcting stroke may also be, adjusted by changing' the'positionof theend of the connecting rod 141 in the slot 24tiofcamleverl13'7 orby locating the other end of the rod manner-em openingin the'pawl'carrier arm 238. f" g I v l eferring'howparticularly to Fig.'9, the detector unit 5S' is arranged to energize thesolenoid'59torelease the. latch'62 in order that theweb-advancingmechanism 143,

14$ n ay'elfecta further'advance' of the web 10 to correct the positionof the web when said photo-sen sitivejdetector 58 is excited by'thereflective characteristics of the web from light to dark; The detectorunit 58 may comprise any usual or preferred photo-sensitive control sys:tem adapted to concentrate a beam of light on the Web and arranged, tobe excited by a rapid change in the reflective characteristics of theweb upon which the beam. is concentrated, such as a, change from lightto dark, as herein illustrated by the spaced registration marks. 12;When the detector unit 58 is excited, as above described, it is arrangedto actuate relay 196 to close circuit 198 and energize-solenoid 59. Inpractice, the lightbeam continues to play upon theweb 10, but the relay196 is actuated only for a predetermined period of time, hereincalledthe scanningpe iqd.

Referring now to Figs. 9 and 10 in particular, the scanning period iscontrolled by the timing switch 60 which includes movable contact.200vand stationary contact 202 mounted on an adjustable bracket 204. Themovable contact 200 is normally urged toward contact 202 by leaf spring201, the switch is operated to open and close a circuit 206 to thedetector unit 58 in timed relation to the operation of the machine by acam 208 fast on cam shaft 90, and a cooperating cam roller 210 iscarried by an arm 212 pivotally mounted at 214. The arm 212 is providedwith a lateral extension arranged to engage and rock movable contact arm200 to open the circuit, 206, and a spring 216. is provided to urge thecam roller 210 against the cam 208.

Thus, the circuit 206 to the detector unit 58 is closed by the cam 208to provide a scanning period during the web-advancing cycle, at whichtime the detector unit is rendered operative to energize the solenoid 59when the light beam is intercepted by a registration mark 12. The timeat which the scanning period commences may be varied by rotating thecontact-carrying bracket 204 mounted for rotary movement on the switchcam shaft 90 and provided with arcuate slotted portion 218 at its outerend arranged to receive a nut and bolt 220 for fastening the bracket inits adjusted position.

In accordance with the present invention, the preferred characteristicsof the detector unit 58 are such that if the light beam is in alignmentwith one of the dark registration marks 12 during the time that the timeswitch 60 is closed, thus indicating that the package sections are inregistration within permissible tolerances, the relay 196 is notactuated. Also, if the light beam is directed on the registration mark12 and then passes to a light portion of the web 10-, properregistration is indicated and the relay 196 not actuated. The only timethat the detecting unit 58 is responsive to the moving Web 10 is whenduring the scanning period" the light beam strikes first a light portionof the web 10 and immediately thereafter strikes the dark registrationmark 12. At this time the time-switch contacts 200, 202 are closed andthe detector unit 58 excited to actuate relay 196 closing circuit 198 toenergize the solenoid 59. The solenoid in turn actuates theweb-advancing mechanism to advance the web an additional increment tocorrect the position of the package-forming sections with relation tothe container-forming and severing mechanisms to form commerciallyacceptable packages.

From the above description it will be seen that provision is made in thepresent apparatus for controlling the continuous advance of a printedweb of containerforming material wherein successive containenformingsections are advanced into operative or registered position withrelation to the adhesive-applying and websevering mechanisms of themachine, the present control mechanism being adapted to correct thelinear advance of the web when a deviation from a predetermined positionof a web section is detected at a predeterminedtime in a cycle ofoperation whereby to maintain the length of individual container-formingsections within predetermined tolerances. It will also be observed thatthe normal advance of the web may be adjusted in a simple and eflicientmanner to accommodate various lengths of container-forming sections.

While the preferred embodiment of the invention has been hereinillustrated and described, it will be under-v stood that the inventionmay be embodied in other forms within the scope of the following claims.

Having thus described the invention, what is claimed 1. In acontainer-forming machine of the type operating in cycles, incombination, adhesive-applying means comprising a roller for applyingadhesive in a predetermined pattern onto, successive sections of acontinuously advanced web, web-feeding means for continuously advancinga web having substantially equally spaced registration marks thereondefining successive container-forming sections comprising a pair of feedrolls normally arranged to continuously feed the web at a rate such asto advance the web a distance slightly less than a predetermined lengthof a container-forming section each cycle of operation, control meansincluding means for detecting the position of a registration mark at apredetermined time during each cycle, and means responsive to saiddetecting means when a deviation from a predetermined position isdetected for effecting a progressive movement of the feed rolls, tocause an additional increment of advance of the weband to provide a netadvance of the web a distance slightly more than said predeterminedlength of a container-forming section during the cycle of operation inwhich such deviation is detected whereby to assure substantialregistration of successive container-forming sections withsaidadhesive-applying means, said adhesiveapplying roller being of acircumference slightly less than the predetermined length of acontainer-forming section and driven at a constant rate of speed andadapted to permit slippage of the web relative thereto when the web isadvanced at variable speeds a distance greater than said circumferenceduring a cycle ofoperation.

2. In acontainer-forming machine of the type operating in cycles, incombination, adhesive-applying means comprising a roller for applyingadhesive in a predetermined pattern onto successive sections of acontinuously advanced web, said roller being driven at a constant rateof speed, web-feeding means for continuously advancing a web havingsubstantially equally spaced registration.

marks thereon defining successive container-forming sections comprisinga pair of feed rolls normally arranged to continuously feed the web at arate such as to advance the web a distance substantially less than apredetermined length of a container-forming section each cycle ofoperation, adjustable means for effecting a.

progressive movement of the feed rolls each cycle of operation toprovide a normal advance of the web a.

distance slightly less than said predetermined length, control meansincluding means for detecting the position of a registration mark at apredetermined time during each cycle, and means responsive to saiddetecting means when a deviation from a predetermined position isdetected for effecting a second progressive movement of the feed rollsto provide a net advance of the web a distance slightly more than saidpredetermined length during the cycle in which said deviation isdetected said adhesive-applying roller being arranged and adapted topermit slippage of the web relative thereto when the web is advanced atvariable speeds during a cycle of operation.

3. In a container-formin g machine of the type operating in cycles, in,combination, adhesive-applying means comprising a roller for applyingadhesive in a predetermined pattern onto successive sections of acontinuously advanced web, web-feeding means for continuously advancinga web having substantially equally spaced registration marks thereondefining successive container-forming sections comprising a pair of feedrolls normally arranged to continuously feed the Web at a rate such asto advance the web a distance slightly less than a predetermined lengthof a container-forming section each cycleof operation, control meansincluding means for detecting the position of a registration mark at apredetermined time during each cycle, and means responsive to saiddetecting means when a deviation from a predetermined position isdetected for eflecting a progressive movement of the feed rolls to causean additional increment of advance of the web and to provide net advanceof the web a distance slightly more than said predetermined length of acontainer-forming section during the cycle of operation in which suchdeviation is detected whereby to assure substantial registration ofsuccessive container-forming sections with said adhesive-applying means,and driving means for said feed rolls including a differential drivehaving a normally stationary part for maintaining a normal drivingconnection to said feed rolls, said additional advancing means beingarranged to move said normally stationary part a small increment toeffect said additional advancing movement, said adhesive-applying rollerbeing of a circumference slightly less than the predetermined length ofa container-forming section and driven at a constant rate of speed andadapted to permit slippage of the web relative thereto when the web isadvanced at variable speeds a distance greater than said circumferenceduring a cycle of operation.

4. A container-forming mechanism as defined in claim 1 wherein thecontrol means includes a normally inoperative photo-sensitive detectordisposed beyond said feed rolls and arranged to cooperate with saidregistration marks, and a timing switch for rendering said detectoroperative to detect the position of a registration mark at apredetermined time in each cycle of operation.

5. In a container-forming machine of the type operating in cycles, incombination, adhesive-applying means comprising a roller for applyingadhesive in a predetermined pattern onto successive sections of acontinuously advanced web, web-feeding means for continuously advancinga web having substantially equally spaced registration marks thereondefining successive container-forming sections comprising a pair of feedrolls normally arranged to continuously feed the web at a rate such asto advance the web a distance substantially less than a predeterminedlength of a container-forming section each cycle of operation,adjustable means for effecting a progressive movement of the feed rollseach cycle of operation to provide a normal advance of the web slightlyless than said predetermined length, control means including means fordetecting the position of a registration mark at a predetermined timeduring each cycle, and means responsive to said detecting means foreffecting a second progressive movement of the feed rolls to provide anet advance of the Web a distance slightly more than said predeterminedlength during the cycle in which said deviation is detected whereby toassure substantial registration of successive container-forming sectionswith said adhesive-applying means, said adhesive-applying roller beingof a circumference slightly less than the predetermined length of acontainer-forming section and driven at a constant rate of speed andadapted to permit slippage of the web relative thereto when the web isadvanced at variable speeds a distance greater than said circumferenceduring a cycle of operation.

References Cited in the file of this patent UNITED STATES PATENTS1,648,769 Hugo Nov. 8, 1927 1,898,723 Fuller Feb. 21, 1933 1,999,164Avery Apr. 23, 1935 2,035,201 Smith et a1. Mar. 24, 1936 2,095,125Cornock Oct. 5, 1937 2,147,223 Vergobbi Feb. 14, 1939 2,249,190 ThompsonJuly 15, 1941 2,249,820 Gulliksen July 22, 1941 2,366,187 Friedwald Jan.2, 1945 2,616,689 Baumgartner Nov. 4, 1952

